Active job

Small Wooden Retaining Wall

I've got a small retaining wall to build along our sloping driveway. Approx 6m in length, a starting height of 1.4m and a finishing height of 0.2m. Looking at using 200 x 50 tounge and groove pine planks + 100 x 100 posts on the outside @ 1.2m apart. I've already dug out the trench and will be purchasing the materials Sat July 1st - cement, boards, posts, drainage. I'm not much of a builder but still have a fair idea, I just need some assistance for 1-2 hours to start and complete the job. Once the ball is rolling I don't think it will take long at all. I have a chainsaw to cut rough non-visible ends but no skill saw. Not after a master builder, just anyone thats got an idea and can help me out for a couple of hours this weekend.